Pump



Dec. 13, 1927. 1,652,323 H I P. A. PETTERSSON PUMP Filed 060.15, 1921v 2shaves-sheet 1 Swwewtoz 351-. fltfi/AXK/ 1 0720.500

$5 M Gum/nag Patented Dec. 13, 1927.

Iran FSTAT TES i zmiexan irmrnasson ow cmcae imtmors.

7 Application filefl necelnber-15, 1921.. .seriaiflubaszaua' Illhisinvention1relates toviinprovements in' rotary pumps,particularly'of the 'valveless type.

lhe--mainfiobject ofitherinvention is to 5 provide a-pumpingdevice ofthe character if described with. impelli1ig:memberswhich shall be/sel'f-emptyingat each engagement thereof so as to eliminate 'b'acksurging'ot the fluid acted-upon. 1o Anotheriob'ject is to produce apmnping devicefot the nature set forth wherein the approaching orcontacting surfaces of the fluid impe ll ng members are so proportionedas torhaveldiiferential velocities in order to reducelslippagetherebetween. I

' A (further object is the production of a pmnping devicei'of the. typespecified having impelling .inemb'ers carrying interchanging elementswhich shall'be adjustableto com pensat'for wear and capableof beingrenewed whenYworn beyond adjustment. Still another? object is theprovision in a pumping device of the' class mentionedloi sealing meansfor the stratifying of the slippage on the' sides of the larger andslower moving impeller. V c

TIA-still further object is'to furnish a umping deviceof the kindreferred-to, inc nding impellers embodying interengagin i 1 cogfjelements" the-pitch ;circles"whereof s all 'at 1 all times be locatedbelow the inlet and out let openings/of the" chambers wherein theyoperate so as to make themfluid sealed.

, An additional object'is tosupply a pump ing device of the genusalluded to, composed" of few partsfofisiniple, light but strong; anddurable construction, readily assembled or. taken apart,convenientlyoperated' as well asieasily repaired, besidesamenable tolow. cost of manufacture.

Other objects and advantages of vention will become apparent as thecation proceeds. j o

With the i aforesaid] objects in "view,- the invention consistsfofthenovel combinations" n; and arrangements of parts hereinafter "describedin" their "preferred "embodiments, pointed #outin the subljoinedclaimsg-Pa'nd illustrated on the annexeddrawings, wherein 5 likeip'artsare designated bythe: same refer- 1 i ence characters throughouttheseveral views.

' Brieflywdescribed, 1 the invention .under f consideration includesinits organization, a'

provided with intersecting chambers of different-sizes whereinarenmounted to i rot-ate V drum-shaped ,impell;ing; members.

vices may The larger one of these members carries at the circumferencethereof spaced cog like elements adapted to engage one at a time with agap'having the contour'ofthe adja cent flanks IOf a pair "of gear teethand formed on the smaller impeller. "'Each'of' V the cog-elements iscapable of entirely filling thetooth-g'ap so that every ounce of fluidforced "outotl the latter. whereby surging back and forth thereof isprevented'whenthe nnpelhng members are'revolvedffl'lhe outside peripherybf the ismaller member that i also includestl e tobth 'gap' 7r'otatesi at an interrelatively higher surface speed than the" faceof'th'e larger member which, carries the cog-elements, this beingconducive to'idecreaseo fslippage between the approachingorcontactingisurfacesof the impellers." The tooth gap ispneferablyformed in a shoe whichis removablyseatedin the smaller membersoi'thatwhemworn' too much it may be renewed. Similarly the cog elementsare disconnectedly attached to the-'Jface of the larger memberin orderto". enable the same to be setout to take up wear,"orfor*replacem'ent atsuch times as it isneeded. 7 For i the purposeofpreventing slippageof'the -fluid on the sides of the larger and V slower revolving member,annular t-ighteners are lodged,-

in ooves'provided therefor; halfway each in" is member and the adj acentwalls of the casin the same serv ng to-straitify in a radia:directionthe*fluid'-'around*the shaft which-drivesfthemember; sothat areduced pressureprevails 'uponthe stufiin boXthru which thi-si shaft"has'to passfi cans are provided-for driving the shafts; by which theimpelling members are rotated inperiectcorrelationyand the power forsetting themembersin inotiommay be applied to either one of theseshafts. The advantages of the invention as here outlined are' -bestrealizedwhenall of its features and sinstrumentalities are-combined inthe one and same structure,- but, usefulde be produced embodying lessthan the whole;

' It will be obvious 1 to those skilled in the art vtowhich theinvention appertains; upon becoming conversant with the; :detailsthereof; that-the same may beincorporated in several' .diiierent"constructions. The-accompanying" drawings; theiefore, are submittedmerely as showing the preferred exemplifi cation of the invention.

' Inthe said drawings:

Figure I is a substantially central longitudinal section 0i a rotarypump constructed according to the present invention; and

Fig. II is a transverse section talten approximately thru the middle ofthe pump 0115111 l ReTerring now to the said views for a detaileddescription oi this improved pumping device, the numeral 11 denotes themiddle part of the pumps casing or housing, which is divided into twointersecting chambers 12 and 13, of dill'erent diameters. Ports l5 and16 are formed in the said part ll, preferably at or near the points ofintersection of the said chambers, on opposite sides thereof, as clearlyseen in Fig. ll. These ports, it is understood, are provided,respectively, for the ingress and egress of the iluid handled by thepump, and may be utilized optionally and intcrciumgcably :lor eitherpurpose, depending upon the direction of motion imparted to theimpellers, betorc referred to and hereinafter specifically de scribed.

Following the contour oi the a'ioremen tioned chambers 12 and iii, areoutwardly directed flanges 18 and it), the particular function of whichwill prescntl y appear. As indiiated in the drawing, these flanges areprovided at the oapositc ends of the said chambers and maybe castintegral therewith, as well as joining each other. From the lowerportions or the flanges 19, project feet 20, respectively positioned twoon each side of the said housing 11, and formed with suitable openingsto receive bolts wherewit'h the pump is rigidly held, in the approvedmanner, to a primary support, designated by the reference letter A inthe drawing hereto annexed. 3

The ports 15 and 16,.above spoken oi, are widened in their upperportions and also surrounded by flanges 22 and 23, to which areconnected inlet and outlet pipes (not shown) wherewith the pump isfurnisl'ied, as usual. The piping, of course, may lead to and from anyconvenient direction.

Heads 35 and 36 are placed against the outer faces of the aforesaidflanges 18, i9, and the corresponding ends of the chambe 12, 13. Theseheads may be held in position by any suitable tastenings, such forinstance as cap screws or.

Hollow bosses 39, 4:0 and ll, i2 are provided in pairs on the said heads35, 36, the same being in alignment with the centers otthe chambers 12,.13, respectively, and adapted to support shafts i3, ll, revolvablytherein. The bosses 39 and all, on the head 35, are closed at theirouter ends, as denoted by i5 and lti, in Fig. II, on the leitchand side,Whereas the bosses 4:0 and 42 are outwardly open, as represented in thesame view, on the right. The latter-named bosses are internally enlargedto provide stullmgpropriate contrivance known in the art may be employedior that purpose. At 51 and 52 are indicated reinforcing ribs thatradiate from the several bosses 35), 4:0, 4:1 and +12, otu wardly towardthe edges of the heads 35 and 36.

Revolvably contained within the chambers it 13 between their said heads35, 36, are rotatable members 53, The lattecare allixed to the shafts4:3, 44, previously mentioncd, as by keys 5:"), 56, and set-screws 57,5b.

()t' the said members, sealin rotor 53 is the smaller and consists, preerably, of a solid body into which is cut an axially parallel gap orchannel 60, that conforms in shape to the normal space interveningbetween the adjacent flanks of apair of gearteeth. As shown, the gap 60may be formed in an open shoe (J1, fitting tightly in a corre spondingly-shapral recess provided in one side of the member 53. The sides ofthe shoe that; come into contact with the adjacent parts of the recessedmember, it will be noted, are given a double transverse taper so as toretain the same firmly, after being driven endwise into position. Theshoe 61 may be made of libre, Babbitt metal, or any other andhubportions of which are united by an approximately central web 63. Atspecified distances apart in the rim of this member,

are provided transverse grooves 64:, each of which ali'ords a seat forthe base 65 of a gear toothtSGQ 13y preference, three gear-teeth 66 areapplied, equidistantly as shown, tothe. circumference of the member 54,and they jointly and severally constitute the impellers hereinbeiorementioned. These gear-teeth are spacedapart from each other in con!tormity with the lengtho't pitch-line of the tooth-space supplied by thegap 60, in the member 53. i

In the outer ends of the said gear-teeth 66, are ilormed sealing grooves67, arranged to receiveeach a small portion of the liquid which beingpumped. This serves as a tightening, packing or sealing medium in reducing the r-alippage as well as eliminating by 'i'riction at the pointoi juxtaposition with the casing or housing 13. The several gearteethare secured, at the base 65, each by a screw-bo]t, as 69, driventhereinto from the inner face of the rim of the member 54.

Shims 70, of tin tlfoil or the like, may be interposed between thebottoms of the grooves 64, and the bases of the gear-teeth 66 seatedtherein. Provision is thus made radially masses for setting out any 1one or all of the gearteeth, as required, to properly yuxtapose theirouter or top surfaces withrespect to the inner sur-facesoffhe casing'13,to the-desired extent. r

At 72, is maimed 5' dished I washer,

throughwhich passes the screw bolt 69, that maintains" the gear-tooth G6in --p'osition,

of -metal or other suitable material, are

lodged in'gmoves provided therefor in the rimand hub portions yofthesaidmember, as also in the contiguous parts of theheads I and 36,-oppositethe same; The rings, it

will be noticed, extend substantially half-way v each into thecorresponding grooves of the member and itsheads. The double annularpacking thus provided serves to diminish the pressure to which thestuffing-box 48, for the shaft 44, is subjected.

Considering that the external circumference of the member 53 coincideswith the outer extremities of the gear-tooth flanks bounding the gap 60,and this circumference has a rolling or approaches a rolling contactwith the outer face of the rim ofthemember which is also the base orfoot circle'ofthe' gear-teeth 66, it is clear that these surfaces 7 passeachother at a difl'erential'rate of speed,

since the coacting circularpitch lines of the gap and teeth 66 movetogether at the same Velocity. This feature of construction,

. it has been demonstrated in practice, reduces to a minimum the backslippage of the fluid which is being transported between any twoof thegear-teeth or impellers 66, from the port 15, around the chamberlii, tothe port 16, or viceversa. j j 7 Upon the shafts 43 and 44, at'a certaindistance from the glands 49 and 50 thereon, are fixed a pinion one intothe other. The coacting pinion and ear, it will be noted, aresufflciently distant rom the glands to allow the latter all neededaccommodation incidental to the packing of the stuffing-boxes 47 and 48,and they are maintained in position by suitable keys and set-screws asshown. The ratio ofthe pinion 77 to the gear 7 8 :is the same as theproportion existing between the size of the gap 60,

in the member 53, and the number of teeth.

66, on the member 54. In practice, the ratio of 1 to 3 has been foundtogive excellent results. p i

' The outer ends of the shafts43 and 44 are journalledin bearings 80, 81formedwith a onihe rim of the member -54. It"

77 and gear 78, meshing frame or bracket 82, the-basal portions/83whereof stand 1 upon the primary support A. Either one of these shafts,it} is understood,

canbe driven by power derived from'anyf convenient-source, forinstance'by means of a pulley-and belting, or through theinstrumentality of any preferred form. of powertransmitting mechanism.

With the View of taking end strains off the member-.54, a collar 84isseeuredtothe. shaft 44, so as tobear against'the outer face of thebearing 8.1:thereof, in opposition to the hub part. of the gear 78. The.power is. applied,"

preferably, to the extrennty of the shaft, 43 or 44, that projectsbeyond the outer bearing, 01-181.

The. operation of the improved rotary pump-herein described is perfectlyobvious to any expert in the art looking overthe fore goingspecificatiom'with the accompanying drawings, and therefore no timewasted in setting forth the same. to say that'the device embodying thepresent invent-ion is of an essentially practical character, and fullycapable of realizing the objects-and vresults for which it has. beenproduced.

While a certain preferred embodiment of this device has beenshown anddescribed,

it will be understood that changes in the form, arrangements,proportions, sizes and details thereof may be made, without departingfrom the scopeof the invention as defined by the appended claims.

Having described my invention what I desire to secure by Letters Patentand claim, .1s: I 7 v 1. A'rotary pump comprising a casing.

having a chamber, an impelling rotor in the chamber, mist and outletpassages, a sealing rotor cooperable with the impelling rotor willfbeSuffice it 7 on i for effecting flow of fluids through the pump, saidsealing rotor comprising a body portion provided with a gap in aperipheral L port-ionthereof, and a shoe of rigid mate-V rial in saidgap.

2. A rotary pump. comprising a' casing having a chamber, an impellingrotor in the chamber, inlet and outlet passages, a sealing rotorcooperable with the impelling rotor'for effecting flow of fluids throughthe pump,

said sealing rotor-comprising a body portion v 7 provided with a ga in aperipheral portion thereof, a 'recesse shoe in said gap, the

walls of the recess portion of said shoe adapted to constantly engagewith the impelling rotor portion cooperating therewith to prevent fluidslippage.

3. A rotarypump comprising a chamber, an impelling rotor in the chamber,inlet and outlet passages, a. sealing rotor cooperable with theimpelling rotor for effecting flow @Of fluids through the pump, saidsealing rotor comprising a body portion having a gap, the shoe in saidgap causing cooperation with a portion ofsaid impellingrotor, said shoehaving a double transverse taper Whereby it may be firmly retained inthe gap of the sealing rotor.

4. A rotary pump comprising a chamber, an impelling rotor in saidchamber and having impellingelements, inlet and outlet passages for thechamber, a sealing rotor having a gap in which said elements areadaptedto extend when the rotors are 0 rated, a recessed shoe in said gap, the.si e portions of the shoe being curved to cooperate with the side facesof said elements for efl'ecting a continuous scaling and prevent fluidslippage. I

5. In a rotary pump, cooperable rotary members,one of said membershaving a gap, the other of said members having adjustable elements"cooper-able with said gap, means for adjusting said elements and meansfor holding said elements and adjusting means in place.

6. In a rotary pump, cooper-able rotary members, one of said membershaving an impeller-engaging gap and the other of said members having animpeller element cooper able with said gap, said gap being formed m ashoe of rigid material detachably con-;

mg to and and means for holding the cogs rigidly m adjusted position. a

a chamber,

an impelling rotor in g 8. In a rotary pump having a chamber and a rotortherein, an nnpelling member carried by the rotor, shims the position ofthe member, means for holding the member in shimmed posltion.

9. In a rotary pump havin a chamber and a rotor therein, an impel ingmember carried by the rotor and extending into a groove provided in saidrotor, shims placed 111 said groove and behind said member for adjustingthe member, and a bolt secured to said member and to said rotor forholding the member and shims in place.

PEHR AXEL PETTERSSO N.

for adjusting and securing CERTIFICATE OF CORRECTION.

Patent No. 1,652,323. Granted December 13, 1927, to

PEHR AXEL PETTERSSON.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 1,line 18, for the word "interchanging" read "'interengaging"; page 2,line 122, for the word "by" read "any"; and that the said Letters Patentshould be read with these corrections therein that the same 'may conformto the record of the case in the Patent Office.

Signed and sealed this 14th day of February, A. D. 1928.

M. J. Moore, Seal Acting Commissioner of Patents.

